Add type definitions for graphql-date (#13818)

* Add type definitions for graphql-date

* Add missing semicolons

graphql-date/graphql-date-tests.ts

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+import {GraphQLObjectType} from 'graphql';
+import * as GraphQLDate from 'graphql-date';
+
+const fooType = new GraphQLObjectType({
+    name: 'Foo',
+    description: 'Some foo type',
+    fields: {
+        created: {
+            type: GraphQLDate,
+            description: 'Date foo was created',
+        }
+    }
+});

graphql-date/index.d.ts

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+// Type definitions for graphql-date 1.0
+// Project: https://github.com/tjmehta/graphql-date
+// Definitions by: Eric Naeseth <https://github.com/enaeseth>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import {GraphQLScalarType} from 'graphql';
+
+declare const date: GraphQLScalarType;
+
+export = date;

graphql-date/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "graphql-date-tests.ts"
+    ]
+}

graphql-date/tslint.json

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+{ "extends": "../tslint.json" }